Regretful feeling is an emotion that is experienced when one realizes they have done something wrong or made a mistake. SHAME, REMORSE, TWINGE, and PANG are all words that can be used to describe this feeling. SHAME is a feeling of guilt or humiliation caused by one's own actions. REMORSE is a deep regret for having done something wrong. TWINGE is a sudden sharp feeling of pain or distress. PANG is a sudden sharp feeling of mental or emotional distress.